the brief history of lumo construction from mit to hu ozgur ates hampton university olympus...
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THE BRIEF HISTORY OF LuMo CONSTRUCTION FROM MIT
TO HU
OZGUR ATESHAMPTON UNIVERSITY
OLYMPUS COLLABORATION MEETING 26-27 APRIL 2011
Luminosity Monitors: Telescopes
Forward telescopes
12o
2 tGEM telescopes, 1.2msr, 12o,R=187/237/287cm, dR=50cm, 3 tracking planes
TOF
LEPTON
PROTON
LEPTON
PROTON
1. Handling The Olympus GEMs at MIT-BATES between June 6th-August 8th 2010
Received the total 51 GEMs come with 5 Batches
Optically Inspected 100% of the GEMs @ MIT
CCD Scanned 30% of the GEMs @ MIT
HV-Tested 100% of the GEMs @ MIT
Glued into the Frames 4 GEMs @ BATES
A DEFECTIVE GEM LAYER FROM CCD SCANNER
Bar Graphs of Inner(left) and Outer(right) Diameters of LUMI Foils
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2. Manufacturing The GEMs at HU-GEM LAB
Stretching and Gluing of GEM+MYLAR+HV Foils
Leakage Current Test using GEM2D Box
Readout Boards – Shortcuts and How To Fix Them...
Up to 5 shorts per board possible Checked all boards with Ohmmeter for shorts Found between 0 and 7 (8?) per board, typically ~3 Verified under microscope and fixed them Currently 8 boards without any shorts
Readout Boards – Shortcuts and How To Fix Them...
blown with current from a 9V battery
Readout Boards – Shortcuts and How To Fix Them...
Readout Boards – Shortcuts and How To Fix Them...
scratched with knife
FIRST SIGNALS FROM GEMS (JUERGEN’s TALK)
SOLDERING PINS INTO THE GEM FRAMES
Gluing Process of The Chambers
PACKING THE CHAMBERS
The Status of The GEM Manufacturing
• Glued 9 GEM Chambers(6+3 Spares):-- 27 GEM Foils--18 Pressure(Mylar) Foils--9 High Voltage Foils--9 Readout Boards with NO Shorts--7 chambers checked with picoammeter.We shipped from HU and we received last week at
here DESY!
LUMI Gas System Test Beam in May
• Many configurations were simulated.• Varied intrinsic res. and distance between
tracking planes.• 100 µm intrinsic res. and 50 cm gap between
Gem1/2 and Gem2/3 show the optimum performance.
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MC Simulation of the GEMsDesign Parameters: Resolutions
Left Sec. RESOLUTIONS
Proton DeltaZ
Electron DeltaZ
Proton Del.Theta
Electron Del.Theta
Proton DeltaPhi
Electron DeltaPhi
Proton DeltaP
Electron DeltaP
100mic./50cmLUMI + MWPC
1.60 mm 1.18 cm 0.52 Deg. 0.09 Deg. 0.52 Deg. 0.22 Deg. 20 MeV 59 MeV
LUMI MS STUDIES --MC runs now on bird@DESY, HUPPCF@HU,
blaster@KPHMZ--We have ROOT files on disk with XY beam offsets--We will analyze those runs soon (NAS is ready now)
***Beam offsets were -1, -0.75, -0.5, -0.25, 0., +0.25, +0.5, +0.75, +1 mm.
Next Steps with the New MC Code:
• Study of systematic effects (beam offset, slope, width; etc.) (ONGOING)
• Simulations of acceptance and count rates
• Simulation of backgrounds
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